發送短信 : Develop a real-time concentration sensor for LDDS

  _  __     ___      _  _     ______            
 | |/ //   / _ \\   | \| ||  /_   _//   ____    
 | ' //   / //\ \\  |  ' ||   -| ||-   |    \\  
 | . \\  |  ___  || | .  ||   _| ||_   | [] ||  
 |_|\_\\ |_||  |_|| |_|\_||  /_____//  |  __//  
 `-` --` `-`   `-`  `-` -`   `-----`   |_|`-`   
                                       `-`